You can expand an existing Virtual SAN cluster by adding hosts or disks to the hosts without disrupting any ongoing operations.
Use one of the following methods to expand your Virtual SAN cluster.
Add new ESXi hosts directly to the cluster. SeeAdd a Host to the Virtual SAN Cluster.
Move existing hosts to the cluster by using Host Profile. See Add a Host to the Virtual SAN Cluster using Host Profile.
New cluster members add storage and compute capacity. If you use Virtual SAN in automatic mode, local storage disks on the new cluster member will be automatically aggregated into a disk group and claimed by the Virtual SAN datastore. If Virtual SAN is set to manual, you must manually create a subset of disk groups from the local storage disks on the newly added host. See Use Manual Method to Claim Disks for Virtual SAN.
Add new storage disks to ESXi hosts that are cluster members. If you use Virtual SAN in automatic mode, the new disk that you add joins an existing disk group. If Virtual SAN is set to manual, you must manually add the disk to the disk group on the host. See Add a Disk to the Disk Group.